// THIS IS A BETA! I DON'T RECOMMEND USING IT IN PRODUCTION CODE JUST YET

/*
 * Copyright 2012 Roman Nurik
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.svmc.app.mobile.controller;

import static com.nineoldandroids.view.ViewHelper.setAlpha;
import static com.nineoldandroids.view.ViewHelper.setTranslationX;
import static com.nineoldandroids.view.ViewPropertyAnimator.animate;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import android.graphics.Rect;
import android.view.MotionEvent;
import android.view.VelocityTracker;
import android.view.View;
import android.view.ViewConfiguration;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.ListView;
import com.nineoldandroids.animation.Animator;
import com.nineoldandroids.animation.AnimatorListenerAdapter;
import com.nineoldandroids.animation.ValueAnimator;



/**
 * A {@link android.view.View.OnTouchListener} that makes the list items in a {@link ListView}
 * dismissable. {@link ListView} is given special treatment because by default it handles touches
 * for its list items... i.e. it's in charge of drawing the pressed state (the list selector),
 * handling list item clicks, etc.
 *
 * <p>After creating the listener, the caller should also call
 * {@link ListView#setOnScrollListener(android.widget.AbsListView.OnScrollListener)}, passing
 * in the scroll listener returned by {@link #makeScrollListener()}. If a scroll listener is
 * already assigned, the caller should still pass scroll changes through to this listener. This will
 * ensure that this {@link SwipeDismissListViewTouchListener} is paused during list view
 * scrolling.</p>
 *
 * <p>Example usage:</p>
 *
 * <pre>
 * SwipeDismissListViewTouchListener touchListener =
 *         new SwipeDismissListViewTouchListener(
 *                 listView,
 *                 new SwipeDismissListViewTouchListener.OnDismissCallback() {
 *                     public void onDismiss(ListView listView, int[] reverseSortedPositions) {
 *                         for (int position : reverseSortedPositions) {
 *                             adapter.remove(adapter.getItem(position));
 *                         }
 *                         adapter.notifyDataSetChanged();
 *                     }
 *                 });
 * listView.setOnTouchListener(touchListener);
 * listView.setOnScrollListener(touchListener.makeScrollListener());
 * </pre>
 *
 * <p>This class Requires API level 12 or later due to use of {@link
 * android.view.ViewPropertyAnimator}.</p>
 *
 * <p>For a generalized {@link android.view.View.OnTouchListener} that makes any view dismissable,
 * see {@link SwipeDismissTouchListener}.</p>
 *
 * @see SwipeDismissTouchListener
 */
public class SwipeDismissListViewTouchListener implements View.OnTouchListener {
    // Cached ViewConfiguration and system-wide constant values
    private int mSlop;
    private int mMinFlingVelocity;
    private int mMaxFlingVelocity;
    private long mAnimationTime;

    // Fixed properties
    private ListView mListView;
    private OnSwipeCallback mCallback;
    private int mViewWidth = 1; // 1 and not 0 to prevent dividing by zero
	private boolean dismissLeft = true;
	private boolean dismissRight = true;
    // Transient properties
    private List<PendingDismissData> mPendingDismisses = new ArrayList<PendingDismissData>();
    private List<PendingSwipeData> mPendingSwipes = new ArrayList<PendingSwipeData>();
    private int mDismissAnimationRefCount = 0;
    private float mDownX;
    private boolean mSwiping;
    private VelocityTracker mVelocityTracker;
    private int mDownPosition;
    private View mDownView;
    private boolean mPaused;

    /**
     * The callback interface used by {@link SwipeDismissListViewTouchListener} to inform its client
     * about a successful dismissal of one or more list item positions.
     */
    public interface OnSwipeCallback {
        /**
         * Called when the user has indicated they she would like to dismiss one or more list item
         * positions.
         *
         * @param listView               The originating {@link ListView}.
         * @param reverseSortedPositions An array of positions to dismiss, sorted in descending
         *                               order for convenience.
         */
        void onDismiss(ListView listView, int[] reverseSortedPositions);
	    void onSwipeLeft(ListView listView, int [] reverseSortedPositions);
	    void onSwipeRight(ListView listView, int [] reverseSortedPositions);
    }

    /**
     * Constructs a new swipe-to-dismiss touch listener for the given list view.
     *
     * @param listView The list view whose items should be dismissable.
     * @param callback The callback to trigger when the user has indicated that she would like to
     *                 dismiss one or more list items.
     */
    public SwipeDismissListViewTouchListener(ListView listView, OnSwipeCallback callback) {
        ViewConfiguration vc = ViewConfiguration.get(listView.getContext());
        mSlop = vc.getScaledTouchSlop();
        mMinFlingVelocity = vc.getScaledMinimumFlingVelocity();
        mMaxFlingVelocity = vc.getScaledMaximumFlingVelocity();
        mAnimationTime = listView.getContext().getResources().getInteger(
                android.R.integer.config_shortAnimTime);
        mListView = listView;
        mCallback = callback;
    }

	/**
	 * Constructs a new swipe-to-action touch listener for the given list view.
	 * 
	 * @param listView The list view whose items should be dismissable.
	 * @param callback The callback to trigger when the user has indicated that she would like to
	 *                 dismiss one or more list items.
	 * @param dismissLeft set if the dismiss animation is up when the user swipe to the left
	 * @param dismissRight set if the dismiss animation is up when the user swipe to the right
	 * @see #SwipeListViewTouchListener(ListView, OnSwipeCallback, boolean, boolean)
	 */
	public SwipeDismissListViewTouchListener(ListView listView, OnSwipeCallback callback, boolean dismissLeft, boolean dismissRight) {
	    this(listView, callback);
	    this.dismissLeft = dismissLeft;
	    this.dismissRight = dismissRight;
	}

    /**
     * Enables or disables (pauses or resumes) watching for swipe-to-dismiss gestures.
     *
     * @param enabled Whether or not to watch for gestures.
     */
    public void setEnabled(boolean enabled) {
        mPaused = !enabled;
    }

    /**
     * Returns an {@link android.widget.AbsListView.OnScrollListener} to be added to the
     * {@link ListView} using
     * {@link ListView#setOnScrollListener(android.widget.AbsListView.OnScrollListener)}.
     * If a scroll listener is already assigned, the caller should still pass scroll changes
     * through to this listener. This will ensure that this
     * {@link SwipeDismissListViewTouchListener} is paused during list view scrolling.</p>
     *
     * @see {@link SwipeDismissListViewTouchListener}
     */
    public AbsListView.OnScrollListener makeScrollListener() {
        return new AbsListView.OnScrollListener() {
            @Override
            public void onScrollStateChanged(AbsListView absListView, int scrollState) {
                setEnabled(scrollState != AbsListView.OnScrollListener.SCROLL_STATE_TOUCH_SCROLL);
            }

            @Override
            public void onScroll(AbsListView absListView, int i, int i1, int i2) {
            }
        };
    }

    @Override
    public boolean onTouch(View view, MotionEvent motionEvent) {
        if (mViewWidth < 2) {
            mViewWidth = mListView.getWidth();
        }

        switch (motionEvent.getActionMasked()) {
            case MotionEvent.ACTION_DOWN: {
                if (mPaused) {
                    return false;
                }

                // TODO: ensure this is a finger, and set a flag

                // Find the child view that was touched (perform a hit test)
                Rect rect = new Rect();
                int childCount = mListView.getChildCount();
                int[] listViewCoords = new int[2];
                mListView.getLocationOnScreen(listViewCoords);
                int x = (int) motionEvent.getRawX() - listViewCoords[0];
                int y = (int) motionEvent.getRawY() - listViewCoords[1];
                View child;
                for (int i = 0; i < childCount; i++) {
                    child = mListView.getChildAt(i);
                    child.getHitRect(rect);
                    if (rect.contains(x, y)) {
                        mDownView = child;
                        break;
                    }
                }

                if (mDownView != null) {
                    mDownX = motionEvent.getRawX();
                    mDownPosition = mListView.getPositionForView(mDownView);

                    mVelocityTracker = VelocityTracker.obtain();
                    mVelocityTracker.addMovement(motionEvent);
                }
                view.onTouchEvent(motionEvent);
                return true;
            }

            case MotionEvent.ACTION_UP: {
	            if (mVelocityTracker == null) {
	                break;
	            }

	            float deltaX = motionEvent.getRawX() - mDownX;
	            mVelocityTracker.addMovement(motionEvent);
	            mVelocityTracker.computeCurrentVelocity(500); // 1000 by defaut but it was too much
	            float velocityX = Math.abs(mVelocityTracker.getXVelocity());
	            float velocityY = Math.abs(mVelocityTracker.getYVelocity());
	            boolean swipe = false;
	            boolean swipeRight = false;

	            if (Math.abs(deltaX) > mViewWidth / 2) {
	                swipe = true;
	                swipeRight = deltaX > 0;
	            } else if (mMinFlingVelocity <= velocityX && velocityX <= mMaxFlingVelocity
	                    && velocityY < velocityX) {
	                swipe = true;
	                swipeRight = mVelocityTracker.getXVelocity() > 0;
	            }
	            if (swipe) {
	                // sufficent swipe value
	                final View downView = mDownView; // mDownView gets null'd before animation ends
	                final int downPosition = mDownPosition;
	                final boolean toTheRight = swipeRight;
	                ++mDismissAnimationRefCount;
	                animate(mDownView)
	                        .translationX(swipeRight ? mViewWidth : -mViewWidth)
	                        .alpha(0)
	                        .setDuration(mAnimationTime)
	                        .setListener(new AnimatorListenerAdapter() {
	                            @Override
	                            public void onAnimationEnd(Animator animation) {
	                                performSwipeAction(downView, downPosition, toTheRight, toTheRight ? dismissRight : dismissLeft);
	                            }
	                        });
	            } else {
	                // cancel
	            	 animate(mDownView)
	                        .translationX(0)
	                        .alpha(1)
	                        .setDuration(mAnimationTime)
	                        .setListener(null);
	            }
	            mVelocityTracker = null;
	            mDownX = 0;
	            mDownView = null;
	            mDownPosition = ListView.INVALID_POSITION;
	            mSwiping = false;
	            break;
	        }

            case MotionEvent.ACTION_MOVE: {
                if (mVelocityTracker == null || mPaused) {
                    break;
                }

                mVelocityTracker.addMovement(motionEvent);
                float deltaX = motionEvent.getRawX() - mDownX;
                if (Math.abs(deltaX) > mSlop) {
                    mSwiping = true;
                    mListView.requestDisallowInterceptTouchEvent(true);

                    // Cancel ListView's touch (un-highlighting the item)
                    MotionEvent cancelEvent = MotionEvent.obtain(motionEvent);
                    cancelEvent.setAction(MotionEvent.ACTION_CANCEL |
                            (motionEvent.getActionIndex()
                                    << MotionEvent.ACTION_POINTER_INDEX_SHIFT));
                    mListView.onTouchEvent(cancelEvent);
                }

                if (mSwiping) {
                    setTranslationX(mDownView, deltaX);
                    setAlpha(mDownView, Math.max(0f, Math.min(1f,
                            1f - 2f * Math.abs(deltaX) / mViewWidth)));
                    return true;
                }
                break;
            }
        }
        return false;
    }

    class PendingDismissData implements Comparable<PendingDismissData> {
        public int position;
        public View view;

        public PendingDismissData(int position, View view) {
            this.position = position;
            this.view = view;
        }

        @Override
        public int compareTo(PendingDismissData other) {
            // Sort by descending position
            return other.position - position;
        }
    }

    private void performDismiss(final View dismissView, final int dismissPosition) {
        // Animate the dismissed list item to zero-height and fire the dismiss callback when
        // all dismissed list item animations have completed. This triggers layout on each animation
        // frame; in the future we may want to do something smarter and more performant.

        final ViewGroup.LayoutParams lp = dismissView.getLayoutParams();
        final int originalHeight = dismissView.getHeight();

        ValueAnimator animator = ValueAnimator.ofInt(originalHeight, 1).setDuration(mAnimationTime);

        animator.addListener(new AnimatorListenerAdapter() {
            @Override
            public void onAnimationEnd(Animator animation) {
                --mDismissAnimationRefCount;
                if (mDismissAnimationRefCount == 0) {
                    // No active animations, process all pending dismisses.
                    // Sort by descending position
                    Collections.sort(mPendingDismisses);

                    int[] dismissPositions = new int[mPendingDismisses.size()];
                    for (int i = mPendingDismisses.size() - 1; i >= 0; i--) {
                        dismissPositions[i] = mPendingDismisses.get(i).position;
                    }
                    mCallback.onDismiss(mListView, dismissPositions);

                    ViewGroup.LayoutParams lp;
                    for (PendingDismissData pendingDismiss : mPendingDismisses) {
                        // Reset view presentation
                        setAlpha(pendingDismiss.view, 1f);
                        setTranslationX(pendingDismiss.view, 0);
                        lp = pendingDismiss.view.getLayoutParams();
                        lp.height = originalHeight;
                        pendingDismiss.view.setLayoutParams(lp);
                    }

                    mPendingDismisses.clear();
                }
            }
        });

        animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator valueAnimator) {
                lp.height = (Integer) valueAnimator.getAnimatedValue();
                dismissView.setLayoutParams(lp);
            }
        });

        mPendingDismisses.add(new PendingDismissData(dismissPosition, dismissView));
        animator.start();
    }
    class PendingSwipeData implements Comparable<PendingSwipeData> {
	    public int position;
	    public View view;

	    public PendingSwipeData(int position, View view) {
	        this.position = position;
	        this.view = view;
	    }

	    @Override
	    public int compareTo(PendingSwipeData other) {
	        // Sort by descending position
	        return other.position - position;
	    }
	}
    private void performSwipeAction(final View swipeView, final int swipePosition, boolean toTheRight, boolean dismiss) {
	    // Animate the dismissed list item to zero-height and fire the dismiss callback when
	    // all dismissed list item animations have completed. This triggers layout on each animation
	    // frame; in the future we may want to do something smarter and more performant.

	    final ViewGroup.LayoutParams lp = swipeView.getLayoutParams();
	    final int originalHeight = swipeView.getHeight();
	    final boolean swipeRight = toTheRight;

	    ValueAnimator animator;
	    if (dismiss)
	        animator = ValueAnimator.ofInt(originalHeight, 1).setDuration(mAnimationTime);
	    else
	        animator = ValueAnimator.ofInt(originalHeight, originalHeight - 1).setDuration(mAnimationTime);


	    animator.addListener(new AnimatorListenerAdapter() {
	        @Override
	        public void onAnimationEnd(Animator animation) {
	            --mDismissAnimationRefCount;
	            if (mDismissAnimationRefCount == 0) {
	                // No active animations, process all pending dismisses.
	                // Sort by descending position
	                Collections.sort(mPendingSwipes);

	                int[] swipePositions = new int[mPendingSwipes.size()];
	                for (int i = mPendingSwipes.size() - 1; i >= 0; i--) {
	                    swipePositions[i] = mPendingSwipes.get(i).position;
	                }
	                if (swipeRight)
	                    mCallback.onSwipeRight(mListView, swipePositions);
	                else
	                    mCallback.onSwipeLeft(mListView, swipePositions);

	                ViewGroup.LayoutParams lp;
	                for (PendingSwipeData pendingDismiss : mPendingSwipes) {
	                    // Reset view presentation
	                	setAlpha(pendingDismiss.view, 1f);
                        setTranslationX(pendingDismiss.view, 0);
	                    lp = pendingDismiss.view.getLayoutParams();
	                    lp.height = originalHeight;
	                    pendingDismiss.view.setLayoutParams(lp);
	                }

	                mPendingSwipes.clear();
	            }
	        }
	    });

	    animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
	        @Override
	        public void onAnimationUpdate(ValueAnimator valueAnimator) {
	            lp.height = (Integer) valueAnimator.getAnimatedValue();
	            swipeView.setLayoutParams(lp);
	        }
	    });

	    mPendingSwipes.add(new PendingSwipeData(swipePosition, swipeView));
	    animator.start();
	  }
}
